Question

How to convert all array keys to uppercased with array_change_key_case() function in PHP

Answer 1

$arr = array("php"=> 1, "c" => 2, "c#" => 3);
print_r(array_change_key_case($arr, CASE_UPPER));
 
     
/*
run:
 
Array ( [PHP] => 1 [C] => 2 [C#] => 3 ) 
      
*/

 

70+ SQL courses for beginners and professionals

Answer 2

$arr = array("php"=> 1, "c" => 2, "c#" => 3);
$arr = array_change_key_case($arr, CASE_UPPER);
print_r($arr);
 
     
/*
run:
 
Array ( [PHP] => 1 [C] => 2 [C#] => 3 ) 
      
*/

 

70+ SQL courses for beginners and professionals